As a test subject in the same Weapon X program that had previously given Wolverine his adamantium claws and skeleton, Wade Wilson received a healing factor that prevented his cancer from killing him.Marvel Source
Wade soon escaped the program and became a freelance mercenary using the name Deadpool, working for various criminal organizations. At times he has teamed up with heroes as well, but these attempts at "being a good guy" rarely stick for long.
Wade is mentally unstable, though whether this is a normal state or is caused by his constant state of hyper-regeneration is unknown. One side effect of his mental state is the belief that he is not a real person but actually a character in a comic book.
Lost opportunity from Foot Gougers, wasted points in More Bullets and SHF.
Oh yea, I'd also go crit on your artifacts/medallion too. Magneto 1% dmg adds really fast especially on a build like this. Armor Buster shoots 6 shots per second, when you have 4k hp and lose 1% hp per hit on a skill that shoots 6 times per second and pierces to hit multiple enemies you lose a LOT of hp really fast.
Superior Healing Factor is pretty lackluster right now. Since you're going with SatB I'd take the points out of SHF and add them to Foot Gougers since it's a great skill, or Bodyslide By One to lower the spirit cost.